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PmodCOLORReferenceManual

The Digilent Pmod COLOR (Revision A) is a color sensor module with the ability to sense red,

green, blue and clear light. The onboard AMS TCS3472 integrates an IR blocking filter to accurately

determine the color of objects as well as sense ambient light under varying lighting conditions and

through attenuating materials.

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Features

 Red, green, blue, and clear light sensing

 IR-blocking filter

 White LED for reflective measurements

 Suitable for use behind darkened glass

 Small PCB size for flexible designs 0.8“ × 1.25” (2.0 cm × 3.2 cm)

 6-pin Pmod connector with I²C interface

 Pass-through Pmod host port for daisy chaining

 Follows Digilent Pmod Interface Specification Type 6

 Library and example code available on the Resource Center

Summary of content (9 pages)

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Pmod COLOR Reference Manual The Digilent Pmod COLOR (Revision A) is a color sensor module with the ability to sense red, green, blue and clear light. The onboard AMS TCS3472 integrates an IR blocking filter to accurately determine the color of objects as well as sense ambient light under varying lighting conditions and through attenuating materials.
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Specifications Parameter Min Typical Max Units Power Supply Voltage 2.7 3 3.6 V Parameter Channel Min Max Units Red Channel¹ 0% 15% counts/μW/cm² Green Channel¹ 10% 42% counts/μW/cm² Blue Channel¹ 65% 88% counts/μW/cm² Clear Channel 11.0 16.6 counts/μW/cm² Red Channel¹ 4% 25% counts/μW/cm² Green Channel¹ 60% 85% counts/μW/cm² Blue Channel¹ 10% 45% counts/μW/cm² Clear Channel 13.2 20.
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Pinout Table Diagram Header J1 Header J2 Jumper JP1 Pin Signal Description PinSignal Description Pin Status 1 IO1/~INT I/O pin 1 or active low interrupt 1 IO1/~INT I/O pin 1 or active low interrupt SCL 2.2 kΩ Pullup to Loaded/ Vcc/No Pullup to Unloaded Vcc 2 IO2/LED_EN I/O pin 2 or LED enable 2 IO2/LED_EN I/O pin 2 or LED enable Jumper JP2 2.
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Serial Communication The Pmod COLOR communicates with the host board via the I²C protocol. By first sending the 7-bit I²C device address of 0101001 (0x29), users may receive the color data from the TCS3472. Each of the four ADC channels (red, green, blue, and clear) sends it's conversion from the ADC to the host buffer simultaneously. The TCS3472 can set the gain and integration time for each round of data collection.
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Command Register The Command register controls the functionality of the internal address pointer and clears interrupts.
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Control Register (0x0F) The Control Register (0x0F) sets the gain factor applied to the ADC color data.
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¹ - This is the value on power-up and reset Quick Start Here is the series of commands to acquire a set of data from the Pmod COLOR via pseudo I²C code. 1. Power on the Pmod COLOR. 2. Provide a START condition and call the device ID with a write bit I2CBegin(0x52); //device ID 0x29 with a write (0) bit 3. Wait to receive an ACK from the Pmod COLOR. 4.
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15. Provide a RESTART condition and call the device ID with a read bit I2CBegin(0x53); //device ID 0x29 with a read (1) bit 16. Wait to receive an ACK from the Pmod COLOR. 17. Collect all 8 data bytes corresponding to the low and high data byte registers of the clear, red, green, and blue data, respectively, waiting to receive an ACK from the Pmod Color between each byte. I2CReadMultiple(8); //read in the 8 data registers taking advantage of the aut o‐incrementing pointer 18. Send a STOP condition.
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Additional Information The schematics of the Pmod COLOR are available here. Additional information about the color sensor including communication modes and specific timings of the chip can be found by downloading its datasheet from the AMS website here here. Example code demonstrating how to get information from the Pmod COLOR can be found on its Resource Center here.